Sketch-board.



N0. 830,769. PATENTBD SEPT. 11, 1906.

E. F. CHANDLER.

SKETCH BOARD.

APPLICATION FILED 001.4, 190s.

INVENTOR BY Maw 3 SHEETS-SHEET 1.

PATENTED SEPT. 11, 1906.

E,- F. CHANDLER. SKETCH BOARD.

APPLICATION FILED 0014, 1905.

3 SHEETS-SHEET 2.

INVENTOR w/r/vssss:

No. 830,769. PATENTED SEPT. 11, 1906. E. P. CHANDLER.

SKETCH BOARD. APPLICATION I'IL'BD 001 .4, 1906.

3 SHEETS-SHEET 3.

; h 1' e e ATIORAIE the object of the invention is to provide a UNITED STATES PATENT OFFICE.

SKETCH-BOARD.

Specification of Letters Patent.

Patented Sept. 11, 1906.

Application filed October 4, 1905. Serial No: 281.317.

To all whom itmay concern.

Be it known that 'I, EDWARD FARINGTON CHANDLER, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented a new and useful Im rovement in Sketch-Boards, of which the f0 lowing is a specification.

This invention relates to an improvement in sketching-boards and towhat is generally known as rapid field sketching-cases'; and

cheap and simple attachment that is easy of operation and particularly adapted to facilitate ascertaining the line or direction of roads, rivers, boundary-lines, &c., and also for various other purposes of engineering, as will readily appear to those having experience in engineering or military surveying work of all kinds.

A further object of the invention is to rovide an attachment capable of being fo ded in a compact form when the board is not in use.

With these briefly-stated ob'ects in view.

- sighted and the direction laidoff upon the paper to agree exactly with the direction or angle of the line with respect to the magnetic meridian and regardless of the direction or course being followed.

The invention also comprises certain de- "tails. of construction and peculiar combination and arrangement of parts by which the device -may be utilized for the purposes stated and also for various other purposes, as

will be fully set forth in the following specification.

In the drawings forming part of this specification, Figure 1 is a view illustrating the manner of using my sketching-board. Fig. 2 is a detail perspective view of the boar Fig.' 3 is a lon 'tudinal section of the same: Fig. 4 is a detai sectional view drawn through the compass, and Fig. 5 is a detail sectional view drawn through the s irit-level. Fig. 6

is a sectional plan viewo the compass-casing. Fig. 7. is a detached perspective view illustrating the attachment of the alidade to its supporting-bracket. Fig. 8 is a diagrammatic view illustrating the use of the board. ,Fig. 9 is a similar view, illustrating the board used as a profile-reporter, and Fig. 10 is a diagrammatic view illustrating the profile of a plot of ground and also showingla portion of profile-paper and illustrating t e manner ofrecording the of he ground. j n carrying out my invention I employ the usual construction of sketch-board A, having paper-carrying rollers B journaled therein and carrying'a roll of paper C, which is extended and stretched over the up or surface of the board. Upon one side of t e board is held any suitable form of a compass D, the casing of which is countersunk in the board, so that the face of the lass will be flush with the upper surface of 516 board. Upon the opposite side of the board I arrange a suita e spirit-level E, also countersunk to avoid obstructions.

Upon one'end of the board and adjacent one of the aper-rollers are secured brackets undulating surface F, in whic is securely held a rod F, and

upon this rod is mounted a bracket G, having s lit ears G, in which operates a -'setscrew 2 for securely clam ing the bracket in any position upon the r0 The lower portion of the bracket'is provided with a forwardlyrojecting'flange G having a threaded b0 t or screw H rojecting therefrom and upon whith is pivotalliy held an alidade I, that is heldand 'clampe in osition b anut H, and interposed between t e nut an the end of the alidade'is a washer H one end H of which is square and bears against the bracket G, so that when the nut is screwed u on the bolt to clam 'the alidade in position t e said washer,

he d a mirror or reflector K. In practice I propose to provide the frame with overlapping flanges to produce a slideway in which the mirror or refiectoris held, which permits the insertion of a new mirror or reflector should the one in use become broken. Upon the opposite end of the alidade is hingedly secured a sight-bar L, having a slot or opening L therein, through which an object is refiected into the mirror. To, the underside of the board A is connected a strap S, through which the operator extends his hand when using the board, thereby providing a convenient means for holding the board.

The manner 'of using my improved board is as follows Assuming the direction or course of aroad or riveris to be ascertained, the operator after adjusting the paper upon the board starts to lay out the course and standing at a certain pointfor example, a, as shown in Fig. 8 of the drawingsselects an object or point 5 of known distance and sights it through the sight-bar by looking into the mirror. The alidade is then clamped and a line is drawn upon the paper according to the scale r5 the drawing is to be made. The operator then advances to the object or point I) and selects another object or point e and adjusts andclamps the alidade and draws a line along the edge thereof from the point b. This operation is repeated throughout the entire course being laid out, and of course care is taken that the board is adjusted so that the needle will always point due north. Besides taking courses and angles in the horizontal lane, as above described, my improved lioard may be used as a hand-level for engineering- Work, to ography, &c. As illustrated in Fig. 9 o the drawings, the instrument is shown as being used for profile-work, and by reference to the said figure it will be seen that the board is'held vertically before the face with its edge in which the spiritlevel is held in a perfectly horizontal position, and then by sighting at a bulls-eye of a level- 3 rod held by arr-assistant the angular altitude is obtained. The alidade is then clamped and a line drawn upon the paper. In this operation the board is held at the same distance from the ground as the bull's-eye upon the level-rod, and care is always taken that the board is held in a perfectly horizontal position. In taking profiles a ruled paper is used, the lines representing a certain scale, the scale being determined according to the 5 distance from which the assistant with the level-rod is stationed from the operator. In Fig. 10 of the drawings I show diagrammatically a plot of ground d in profile, above which are the lines e, which are drawn upon 0 the paper to correspond with the profile of the ground. 4

From the foregoing it will be seen that I provide a very cheap, simple, and highly efficient device by which the direction of a road or the undulatingsurface of the ground may be easily and accurately recorded, and in certain classes of workfor instance, in military surveying, in which rapidity in laying out a course is almost as essential as accuracv-my invention will be found most useful, as a given course or a plot of ground may be rapidly and accurately recorded. It may be 'further stated that in practice I propose to provide one edge of the alidade with a scale, and the advantages of hinging the mirrorframe and sight bar permit them being folded against the alidade when the board is not in use, thus providing a compact device, which not only facilitates transportation,

but also decreases the danger of the several parts'becoming broken .or bent out of alinement.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is 7 5 1. In a sketching-beard, the combination with the board, of an alidade pivotally held at one end upon the board, said alidade having a reflector at one end and a sight-bar at its opposite end. 8o 2. In a sketching-board, the combinat on with the board, of an alidade adjustably held thereon, said alidade having a hinged frame carrying a reflector connected thereto at one end and a s ght-bar hingedly connected to its opposite end. -3. In a sketching-board, the combination with the board, of a bracket adj ustably connected thereto, an alidade pivotally connected' to the bracket, said alidade having a re- 0 flector, and a sight-bar positioned thereon.

- 4. In a sketching-board, the combination with a board, of a rod held thereon, a bracket adjustably mounted upon the rod, an alidade pivotally connected at one end to the bracket, 5 said alidade having a reflector at one end and a sight-bar at the opposite end, and means for holding the alidade in its adjusted position.

a 5. In a sketching-board, the combination with the board, of a rod held thereto, a bracket adjustably mounted upon the rod and having a set-screw for clamping it upon the rod, and an alidade pivotally connected to the bracket, a folding reflector pivotally 10 connected to one end of the alidade, a folding sight-bar pivotally connected to the'opposite end of the alidade, and means for clamping the said alidade to the bracket.

6. In a sketching-board, the combination no with the board, of a rod connected thereto, a bracket adjustably mounted upon the,rod, said bracket having a forwardly-projecting flange, a bolt projecting from the flange, an alidade pivotally connected to the bolt, 2. n5 clamping-nut operating upon the bolt, and a washer interposedbetween the said alidade and the clamping-nut, said washer having a square edge bearing against the bracket, all

for the purpose specified.

7. In a sketching-board, the combination with the board, of a rod connected thereto, a bracket adjustably mounted upon the rod, said bracket having a flange projecting there from, a bolt supported by the flange, an ali- I25 dade having a perforation through which the said bolt rojects, and by which the alidade is pivotal yconnected to the bracket, a clamping-nut operating upon the bolt, a washer interposed between theend of the alidade and 30 the nut, and having a square edge which is adapted to engage the bracket, a frame carrying a refiector'hingedly connected to the alidade, and a sight-bar also hingedly connected to the alidade.

8. In a sketching-board, the combination with the board, having paper-carrying rollers. journaled therein, a compass arranged upon one side of the board, and a spirit-level connected to the op osite side of the board, of a bracket adjusta b of the board, and an alidade pivotally connected to the bracket, and common means for holding the alidade to the bracket, and also clamping it in its adjusted position.

9. A sketching-board of the kind described,

comprising a board having paper-carrying rollers journaled therein, and adapted for holding a length of the paper across the board, a compass arranged upon one edge of the board, and a spirit-level arranged upon the board opposite the compass, a rod mount ed upon the card adjacent one of the pa ercarrying rollers a bracket slidably retalned upon the rod, and having a set-screw for clamping it in position, an alidade pivotally connected to the bracket, a hinged reflector secured to the alidade adjacent its pivotal end, a sight-bar hingedly connected to the opposite end of the alidade, and means for clamping the alidade in position.

10. A device of the kind described, comprising a board adapted for holding a roll of paper, andhaving a compass arranged upon one side, and a spirit-level arranged upon the opposite side, an alidade adjustably mounted upon the board and adapted to be moved from one side of the board to the other, and also adapted to be moved upon an arc, and

ly mounted at one end means for clamping the' said alidade in the position to which it has been adjusted.

11. A sketching-board of the kind described, comprising aboard pro er, a bracket adjustably retained at one GIRFOf the board and adapted to be moved from one side to the other, an alidade pivotally connected to the bracket and adapted to be moved upon the arc of a circle, a reflector hingedly connected to the alidade adj acentits pivotal end, a sight-bar hingedly connected to the alidade at its outer end, and means for clamping the alidade in its adjusted position.

12. A sketching board of the kind described, comprising a board proper having paper-carrying rollers journaled in the ends thereof, a compass arranged upon one edge of the board, a spirit-level arranged upon the opposite edge of the board, a rod held at the end of the board adjacent one of the paper carrying rollers, a bracket ad justably mounted upon the rod, and having a set-screw for clamping it in position, said bracket also havin a forwardly-projecting flange, a bolt held y the flange, an alidade pivotally mounted upon the bolt, a nut operating upon the bolt, a washer interposed between the nut and the alidade, a frame hingedly connected to the alidade, and having channelways adapted to receive and hold a mirror or reflector, and a sight-bar also hingedly connected to the alidade, said frame and sightbar being adapted to fold down upon the fiaclc of the alidade, all substantially as speci- EDWARD FARINGTON CHANDLER. Witnesses: I

M. D. 'BLoNDELL, E. M. VENN. 

